1 files changed, 89 insertions, 0 deletions
diff --git a/flib/src/mspec~.c b/flib/src/mspec~.c
new file mode 100644
index 0000000..02000cd
--- /dev/null
+++ b/flib/src/mspec~.c
@@ -0,0 +1,89 @@
+/* flib - PD library for feature extraction 
+Copyright (C) 2005  Jamie Bullock
+
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public License
+as published by the Free Software Foundation; either version 2
+of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+*/
+
+
+
+/* Compute the magnitude spectrum of a signal given the real and imaginary components of an fft. The output maximum is normalised to 1. If an argument of 2 is given, the power spectrum is output */
+
+#include "flib.h"
+#define SQ(a) (a * a)
+
+static t_class *mspec_class;
+
+typedef struct _mspec {
+  t_object  x_obj;
+  t_float f;
+  t_int p;
+} t_mspec;
+
+static t_int *mspec_perform(t_int *w)
+{
+  t_sample *in1 = (t_sample *)(w[1]);
+  t_sample *in2 = (t_sample *)(w[2]);
+  t_sample *out = (t_sample *)(w[3]);
+  t_int N = (t_int)(w[4]),n;
+  t_int p = (t_int)(w[5]);
+  if(p == 2){
+	  for (n = 0; n < N; n++){
+		  if(in1[n] != 0 && in2[n] != 0)
+			  *out++ = (SQ(in1[n]) + SQ(in2[n])) / N;
+		  else
+			  *out++ = 0;
+	  }
+  }
+  else{
+	  for (n = 0; n < N; n++){
+			  if(in1[n] != 0 && in2[n] != 0)
+				  *out++ = q8_sqrt(SQ(in1[n]) + SQ(in2[n])) / N;
+			  else
+				  *out++ = 0;
+	  }
+  }
+  return (w+6);
+}
+
+static void mspec_dsp(t_mspec *x, t_signal **sp)
+{
+  dsp_add(mspec_perform, 5,
+          sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec, sp[0]->s_n, x->p);
+}
+
+static void *mspec_new(t_floatarg f)
+{
+  t_mspec *x = (t_mspec *)pd_new(mspec_class);
+  if(f == 2)
+	  x->p = 2;
+  else
+	  x->p = 0;
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal);
+  outlet_new(&x->x_obj, &s_signal);
+  return (void *)x;
+}
+
+
+void mspec_tilde_setup(void) {
+  mspec_class = class_new(gensym("mspec~"),
+        (t_newmethod)mspec_new,
+        0, sizeof(t_mspec),
+        CLASS_DEFAULT, A_DEFFLOAT, 0);
+
+  class_addmethod(mspec_class,
+        (t_method)mspec_dsp, gensym("dsp"), 0);
+  CLASS_MAINSIGNALIN(mspec_class, t_mspec,f);
+  class_sethelpsymbol(mspec_class, gensym("help-flib"));
+}